In a prestigious health resort for wealthy women, strange things begin to happen: nails appear in the massage sponges, poorly rinsed paint ends up in a mud bath, dead carp are found in the jacuzzi, and living worms are in a dish of yogurt. Isn’t this an attempt to discredit and ruin a thriving establishment? And who could be interested in its collapse — a jealous person or a competitor? The investigation is taken up with pleasure by the well-known sleuth Hanna Wulf, because it’s not often you have to look for a criminal in a paradise-like place where they pamper you with massages, therapeutic masks, and aromatic baths.